Concrete-floor construction.



No. 845,465. PATENTED FEB. 26, 1907. F. A. KOETITZ.

CONCRETE FLOOR CONSTRUCTION. APPLICATION FILED APB..17. 190s.

' means for more UNITED STATES l liliDliIi I lC-K A. KOlrITlTZ,

PATENT OFFICE.

Q1 SAN FRANCISCO, CALIFORNIA.

CONCRETE-FLOOR CONSTRUCTION.

Specification of Letters Patent.

Patented Feb. 26, 1907.

A pplicxzion tiled April 17,1906. Serial No; 312,200.

To all whom it mu (fllli-I'LI'Il.

Be it known that l, Fnnnnnicn A. lion'rt'rz,

a citizen of the United States, residing at. the city and county of ban Francisco, and State j reinforce and supportfor the concrete slab, which may be one or two or more inches thick. This slab is allowed to set. one or more wooden forms are placed on the slab crosswise between the I-beams,

with the forms wider at the top than at the side of the titled in with concrete and the 1 bottom. The spaces on each horns are it i-n latter allowed to set. Then the forms are taken out and the voids left by the removed forms bridged over by slabs, the lat-or plastercd over with concrete, and the top finished. This entails at least four operations and takes considerable time in waiting for the. concrete laid in atthe several operations to set. Furthermore, there is always the danger of the new concrete not knitting c-loscwith that; set, and therefore failing, to secure a perfectly and homogeneously bonded structure.

A floor system may be constructed by 1lSlIlfZtOrlRC0ttt1ill(: and concrete joists alter-- nately, which does not give a continuous bond along the bottom, and the top surface of the tile; structure requires additional concrete covering in many cases, islimited for depth to commercial titer, and is rather expensive.

The object of my invention s to provide a 'apidly and economically forming cement floors in the full depth of the floor system with voids in the interior of the concrete, as usual, to reduce dead weight, to make the entire concrete lloor and ceiling actically in one operation, and to produce a thoroughly homogeneous and therefore a. st ronger and more durable structure at less expense.

The invention consist of the parts and tlu construction and combination of parts as{ hereinafter more fully described, having refand metal extending between the I-bcani. placing the 1 metal between the beams and using it as a t Then erence to the accompanying drawings, in which- Figure 1 is a section transverse to the joists. Fig. 2 is a section at right angles with Fig. 1. Fig. 3 is a view similar to Fig. 2, but 'showing another method of applying the flooring. l

In carrying out my invention a ceilingf slab 1, joist 2, and Falling 3 of concrete and 1 metal 4 are formed in the usual manner hetween adjacent beams or walls. All are of appropriate strength and thickness commonof the particular case. to be 1 later removed, or expensive tile I employ suitable molds 6 of light stiff material, as corrugated sheet metal, bent into inverted-U-shape [form and of desiredv length and lathese I l l l surate with the requirement Instead of using wooden molds,

crosswise between the I beams or we ls arch fashion, with the open part of the U downward, these. molds to become a. permanent;

Therefore they are The size of these coron the depart of the structure. i preferably fireproof. rugated metal forms will depend sired proportion the voids shall bear to the body of concrete or to fulfil the re uired strength of the floor structure. Wit the ceiling-slabs or lower iaycr of concrete in place and while yet fresh the forms are laid in and-partly embedded therein, whereupon concrete is packed in around and over the forms and the top finish d off. The rough lloor is then finished. The forms are left in place, and being of corrugated metal and arched in the manner described they add materially to the strength of the structure. Besides, the'conerete being all laid in practically while fresh, it is all firmly bonded together, and with the top finished there are no joints, and the entire concrete mass is homogeneous. Moreover, my method results in a. great; saving of time to the contractor, since he does not have to wait,first,for the concrete to set in order to put in his forms not, seeondly, for him to take out his forms in one case or provide expensive tile in the other case. In OI(l(1' to prevent the sides of the fornzs or arches fro .1 being deformed by pressure of the concrete filling, I employ plates or braces 7, extended across the open l)0u;t01tlS ol' the forms. The open ends of the foruzs l may also be clos -i against the entrance of concrete by plates. as at 8.

i Having thus dcscribeu my inventioh, what I claim, ami desire to secure. by L-wum's PM. an: bran-1i against the pressure of tilt; .OO- lfzi'. Mun-ma wig-acorn ilTCilLS, and plates 1'0:

ent.1s-.

An improved (,OllttlOlO-flhli-lI101iii iiuiiiiing iQ .i3}; iiw viids (if \il'. im-iws. colisu'aicliun runsisiing of 1min suppuvis, u 1n 'n'ril. wiu-ri-ui 1 have iwx'vumo sot cmurviwanduail ceiling in ruul' mxmwimy iunui =11 EHLSQH'": ni Win subscribing witmi t-Lurmviiii, six-veti:.ct:ilLwruguwii :Ucii-Ti (USP/053d iwtwcvn 11w suppims and having a length loss than the liihiflifi hi-ua'c-cz: thes1ipp0rts.-plmus extending u'zulswi-bcly across the lower part. of (he arches mid iixwi to the; sides (hcrvof whun'riiy the said sides nos-5 FRL'ZLHZnICK A. 'uZOIQTiTZ.

\i'itm svsz S. H Xoynsic, Luuuits H. HARVEY. 

